it was not the end of the world and we should continue
ENH: anchor a bit mor. Use \d and \w where possible. Escape a literal .
ENH: asterisk -- use \S instead of [^:] + prefix failregex with ^\[

detected date portion is stripped from the string to be matched, so it is not only
the right ] is left, but also the left one ;-)
DOC: Changelog for asterisk hardening
ENH: 'heavydebug' level == 5 for even more debugging in tricky cases

I mocked logging library directly -- seems to be Ok.
RF: reworked -regex cmdline tool to use optparse, some unification and enhancement of outputs
ENH: fail2ban-regex -- add specification of loglevels to enable
DOC: Changelog for fail2ban-regex RF